Boletín de aludes

Mt Hood

Feb 9 – 10, 2019Northwest Avalanche Center
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Archivado · caducó 8 years ago

Peligro de aludes

Mon
Alta montaña
3 · Notable
Límite del bosque
3 · Notable
Bajo el límite
2 · Moderado
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Lo esencial

You are likely to trigger a storm slab where recent moderate winds have stiffened snow surfaces or where settlement and sunshine consolidate the thick storm snow layer into a slab. The slab sits on heavily faceted old snow which will increase slab propagation to produce large avalanches.

Problemas de aludes

  • Storm Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely
    Tamaño
    1

    Plenty of new snow sits in the terrain and will be most likely to trigger where it has formed a slab. Large and dangerous slabs are likely to form where (1) recent moderate winds which transported low density snow into a soft slab or where (2) settlement or the sun consolidates snow into a slab. The consolidation in many cases may occur during the day on Sunday, leading to increasingly reactive conditions as the day wears on. Travel in less wind-affected terrain, using visual clues such as recent soft cornices and textured snow surfaces to identify these problematic areas. Use small test slopes to gauge the storm slab problem. If you experience sudden settlement of the upper snowpack or cracking of the snow surface, you have a dangerous slab problem in your area. If you’re unsure whether this problem exists, it is best to choose supported terrain less than 35 degrees.

Discussion

Snow and Avalanche Discussion

9-14” of storm snow fell at low density from mid-day Friday through the end of the day Saturday. The storm snow buried surface hoar or near surface facets near and below treeline or a crust BTL and on sun-affected aspects. Areas that head weak underlying snow are more likely to produce avalanches Sunday.  Loose dry avalanches will continue to be a concern in very steep terrain that isn't wind affected. Keep this in mind around terrain traps; you don't want a small but fast moving avalanche to take you on an unexpecting ride into trees or over a cliff.   

Snowpack Discussion

Regional Synopsis coming soon. 

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